Encoder EAN / UCC - 13 in Java How To Use It

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Using this plug-in is much simpler than explaining its workings All you have to do is make a call to While(), passing it an expression as a string and an array of calls to be chained if the expression evaluates to true, like this:

Here the variable c is assigned the value 0, then While() is called, passing it the expression c++ < 3 Each time the chain repeats, the value of c will be incremented until it is 3, at which point the expression will evaluate as false, so the While() will finish In this instance, the object obj will pulsate three times and then be invisible Here s a much more interesting example that animates a ship sailing on the sea, including effects such as fading in and out:

The two lines of HTML set up a div to represent the sea and display an image of a sailing ship Next, the <script> section starts off by obtaining the width and height of the browser and setting x and y to values for the sailing ship to use in a call to the Slide() plug-in After this, the sea is given the property style of absolute so that it can be placed in an exact location, and is then resized so that it takes up the bottom 50 pixels of the browser To represent the sky and sea colors, the documentbody object has its background color changed, while the sea object also has its background color changed Finally, the ship is located at its start position of 0,y The final part of this example is the While() statement, which passes the following expression:

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KEY_PRESS is a global variable that is automatically set to whatever the value of the last key pressed happens to be, so this expression will return true until the space bar is pressed The first three statements in the chain of calls are pretty obvious; they fade the ship in, move it across the browser, and then fade it out However, the final call is a little more interesting because it s an example of using the CallBack() plug-in to turn a nonchainable plug-in (in this case GoTo()) into a chainable one, for just this single call It uses the InsVars() plug-in to insert the variables and values into the string containing the GoTo() call This string is then placed within a call to CallBack() and becomes chainable Therefore, the fourth statement moves the ship back to the start position ready for its next voyage if the space bar still hasn t been pressed

note Because the expression passed to the While() statement is tested only at the start of each

chain of calls, an entire chain will always execute before it can be stopped If you need more precise control than this you can always empty the global array CHAIN_CALLS (which contains all the items in a chain) This will stop a chain after the current statement has finished and can be done by issuing the statement CHAIN_CALLSlength = 0 If you need an even speedier reaction to user input, a While() statement is not your best choice of plug-in, and you should be looking at creating some event-driven code